Preparations before use
Hydraulic oil - quality.
The machine’s performance will, to a high degree, depend on keeping the hydraulic oil intact.
The greatest elements of risk for the quality of the oil are
• Excessively high temperature which entails poor lubrication performance and risk of faults and
break-down of expensive components such as valves, pumps and motors.
• Condensation which is formed during conditions including humid air combined with temperature
fluctuations. (the oil tank breathes through the filter and sucks in humid air)
• Condensation water in the oil has the same effect as excessively high oil temperature.
Condensation appears mainly during use in conditions involving humid air and temperature
around 0°C. The oil tank is equipped with a draining plug for changing oil and checks for
condensation.
Oil level check.
The machines are filled with 78 litres hydraulic oil from the factory. Recommended oil quality is ISO VG46
(viscosity group 46). Examples of such oils are Ambra Hydrosystem 46 HV, Mobil DTE15m, Statoil
Hydraway HVXA46.
The oil level must be checked by observing the sight glass A which is fitted in the suction grille for the
hydraulic oil tank.
Oil temperature check
It is very important to keep track of the oil temperature B and avoid situations where it exceeds 70
degrees. This situation may occur during unfavourable operating conditions for example in case of too
high rotational speed during use.
If the temperature exceeds 70 degrees, the machine must be stopped until a lower temperature has been
“established”.
If the machine has had excessively high hydraulic oil temperature, the oil must be changed.
This is an unconditional requirement in the guarantee provisions.
Condense check
The oil tank is equipped with a drainage plug C in the bottom. Grey oil is an indication of water in the oil.
In case the oil is polluted with water, all the hydraulic oil must be changed.
Beyond such conditions, the hydraulic oil must be changed every year or after 500 operating hours
(whatever occurs first).
Drive shaft
The requirement for the length of the drive shaft will vary in pace with the size of the tractor and the
length of the steady-braces.
If there are operating angles from 25 degrees and upwards, you should employ a category 6 shaft to
ensure long service life.
If there are great angles, it might be advantageous either to lower the tractor or elevating the machine. It
may be elevated by means of the supporting legs which is standard equipment fitted in the corners and
elevate the machine up to 80mm.
Ensure that the pto shaft had sufficient length. The profile tubes in the shaft are to, after any cutting,
overlap by half the tube length. Any cutting of the shaft must be executed in accordance with the
instructions for such operations – the cut must be trimmed for burrs both on the inside as well on the
outside and the profile tubes should be well greased. Too short telescope length of the shaft entails a risk
of overload of the tractor’s power take-off and the gearbox of the VM420.
Please lubricate the PTO drive shaft before use.
The locking chains for the plastic covers are always to be fixed to the appropriate brackets in order to
prevent the covers to rotate.
The drive shaft must be maintained and used in accordance with its instruction manual.
In order to obtain better operating angle, you may let the machine stand by itself and place the tractor at
a distance and employ a longer drive shaft during operation.
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